//
// Created by liushuai on 12/18/19.
//
#include "swapNode.h"
ListNode *swapNode(ListNode *head) {
  ListNode *currentNode = head;
  if (head && head->next) {
    int temp = head->val;
    head->val = head->next->val;
    head->next->val = temp;
    head = head->next;
    if (head->next) swapNode(head->next);
  }
  return currentNode;
}
